Top-Quark FCNC Decay t-cgg in Topcolor-assisted Technicolor(7)

The topcolor-assisted technicolor (TC2) model predicts several pseudo-scalars called top-pions and at loop level they can induce the FCNC top quark decay t->cgg which is extremely suppressed in the Standard Model (SM). We find that in the allowed parameter

Table1:PredictionsforthebranchingratiosoftheFCNCtopquarkdecays.TheTC2predictions

TC=0.4.TheMSSMpredictionsarethemaximalaretakenfromFig.3forMTC=300GeVandKUR

valuesintheallowedparameterspace.

MSSM

Br(t→cZ)O(10 7)[4]

Br(t→cγ)O(10 7)[4]

Br(t→cg)O(10 5)[4]

Br(t→cgg)O(10 4)[4]

2ag2sPL γργµγλ(Cρλ1+Cρλ2+2Cρλ3)+γργµk/(Cρ1+Cρ2+2Cρ3)

+mtγργµ( Cρ1+Cρ2)+mtγµγρ( Cρ1+Cρ2)+mtγµk/( C01+C02)

+m2tγµ( C01+C02)

iΣ(p1 t)=

2aPL[p/c(B41+B51+2B61)+mt( B40+B50)]

(A1)(A3)

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